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One of the main factors influencing the transition of retained austenite into martensite in TRIP structure steels during drawing process is the strain intensity. In drawing processes, it occurs high strain inhomogeneity caused by the conical shape of the die approach section, as well as by the friction occurring between the tool and the material. The occurring redundant strain causes high inhomogeneity in the distribution of mechanical properties on the cross-section of wire being drawn. One of the directions aiming at enhancing the homogeneity of the drawn wire properties is to change the shape of the die working section. The paper presents the results of the investigation of the effect of the quantity of retained austenite in TRIP-type steel wires with a carbon content of 0.29 wt.-% C drawn using conical (conventional), concave and convex dies on the mechanical properties of drawn wires.

Effect of the die approach zone shape on the transition of retained austenite and the mechanical properties of TRIP steel wires